00001 /* 00002 * RTP input/output format 00003 * Copyright (c) 2002 Fabrice Bellard 00004 * 00005 * This file is part of FFmpeg. 00006 * 00007 * FFmpeg is free software; you can redistribute it and/or 00008 * modify it under the terms of the GNU Lesser General Public 00009 * License as published by the Free Software Foundation; either 00010 * version 2.1 of the License, or (at your option) any later version. 00011 * 00012 * FFmpeg is distributed in the hope that it will be useful, 00013 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00015 * Lesser General Public License for more details. 00016 * 00017 * You should have received a copy of the GNU Lesser General Public 00018 * License along with FFmpeg; if not, write to the Free Software 00019 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 00020 */ 00021 00022 #include "libavcodec/bitstream.h" 00023 #include "avformat.h" 00024 00025 #include <unistd.h> 00026 #include "network.h" 00027 00028 #include "rtp.h" 00029 00030 //#define DEBUG 00031 00032 /* from http://www.iana.org/assignments/rtp-parameters last updated 05 January 2005 */ 00033 /* payload types >= 96 are dynamic; 00034 * payload types between 72 and 76 are reserved for RTCP conflict avoidance; 00035 * all the other payload types not present in the table are unassigned or 00036 * reserved 00037 */ 00038 static const struct 00039 { 00040 int pt; 00041 const char enc_name[6]; 00042 enum CodecType codec_type; 00043 enum CodecID codec_id; 00044 int clock_rate; 00045 int audio_channels; 00046 } AVRtpPayloadTypes[]= 00047 { 00048 {0, "PCMU", CODEC_TYPE_AUDIO, CODEC_ID_PCM_MULAW, 8000, 1}, 00049 {3, "GSM", CODEC_TYPE_AUDIO, CODEC_ID_NONE, 8000, 1}, 00050 {4, "G723", CODEC_TYPE_AUDIO, CODEC_ID_NONE, 8000, 1}, 00051 {5, "DVI4", CODEC_TYPE_AUDIO, CODEC_ID_NONE, 8000, 1}, 00052 {6, "DVI4", CODEC_TYPE_AUDIO, CODEC_ID_NONE, 16000, 1}, 00053 {7, "LPC", CODEC_TYPE_AUDIO, CODEC_ID_NONE, 8000, 1}, 00054 {8, "PCMA", CODEC_TYPE_AUDIO, CODEC_ID_PCM_ALAW, 8000, 1}, 00055 {9, "G722", CODEC_TYPE_AUDIO, CODEC_ID_NONE, 8000, 1}, 00056 {10, "L16", CODEC_TYPE_AUDIO, CODEC_ID_PCM_S16BE, 44100, 2}, 00057 {11, "L16", CODEC_TYPE_AUDIO, CODEC_ID_PCM_S16BE, 44100, 1}, 00058 {12, "QCELP", CODEC_TYPE_AUDIO, CODEC_ID_QCELP, 8000, 1}, 00059 {13, "CN", CODEC_TYPE_AUDIO, CODEC_ID_NONE, 8000, 1}, 00060 {14, "MPA", CODEC_TYPE_AUDIO, CODEC_ID_MP2, -1, -1}, 00061 {14, "MPA", CODEC_TYPE_AUDIO, CODEC_ID_MP3, -1, -1}, 00062 {15, "G728", CODEC_TYPE_AUDIO, CODEC_ID_NONE, 8000, 1}, 00063 {16, "DVI4", CODEC_TYPE_AUDIO, CODEC_ID_NONE, 11025, 1}, 00064 {17, "DVI4", CODEC_TYPE_AUDIO, CODEC_ID_NONE, 22050, 1}, 00065 {18, "G729", CODEC_TYPE_AUDIO, CODEC_ID_NONE, 8000, 1}, 00066 {25, "CelB", CODEC_TYPE_VIDEO, CODEC_ID_NONE, 90000, -1}, 00067 {26, "JPEG", CODEC_TYPE_VIDEO, CODEC_ID_MJPEG, 90000, -1}, 00068 {28, "nv", CODEC_TYPE_VIDEO, CODEC_ID_NONE, 90000, -1}, 00069 {31, "H261", CODEC_TYPE_VIDEO, CODEC_ID_H261, 90000, -1}, 00070 {32, "MPV", CODEC_TYPE_VIDEO, CODEC_ID_MPEG1VIDEO, 90000, -1}, 00071 {32, "MPV", CODEC_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO, 90000, -1}, 00072 {33, "MP2T", CODEC_TYPE_DATA, CODEC_ID_MPEG2TS, 90000, -1}, 00073 {34, "H263", CODEC_TYPE_VIDEO, CODEC_ID_H263, 90000, -1}, 00074 {-1, "", CODEC_TYPE_UNKNOWN, CODEC_ID_NONE, -1, -1} 00075 }; 00076 00077 int ff_rtp_get_codec_info(AVCodecContext *codec, int payload_type) 00078 { 00079 int i = 0; 00080 00081 for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++) 00082 if (AVRtpPayloadTypes[i].pt == payload_type) { 00083 if (AVRtpPayloadTypes[i].codec_id != CODEC_ID_NONE) { 00084 codec->codec_type = AVRtpPayloadTypes[i].codec_type; 00085 codec->codec_id = AVRtpPayloadTypes[i].codec_id; 00086 if (AVRtpPayloadTypes[i].audio_channels > 0) 00087 codec->channels = AVRtpPayloadTypes[i].audio_channels; 00088 if (AVRtpPayloadTypes[i].clock_rate > 0) 00089 codec->sample_rate = AVRtpPayloadTypes[i].clock_rate; 00090 return 0; 00091 } 00092 } 00093 return -1; 00094 } 00095 00096 int ff_rtp_get_payload_type(AVCodecContext *codec) 00097 { 00098 int i, payload_type; 00099 00100 /* compute the payload type */ 00101 for (payload_type = -1, i = 0; AVRtpPayloadTypes[i].pt >= 0; ++i) 00102 if (AVRtpPayloadTypes[i].codec_id == codec->codec_id) { 00103 if (codec->codec_id == CODEC_ID_PCM_S16BE) 00104 if (codec->channels != AVRtpPayloadTypes[i].audio_channels) 00105 continue; 00106 payload_type = AVRtpPayloadTypes[i].pt; 00107 } 00108 return payload_type; 00109 } 00110 00111 const char *ff_rtp_enc_name(int payload_type) 00112 { 00113 int i; 00114 00115 for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++) 00116 if (AVRtpPayloadTypes[i].pt == payload_type) { 00117 return AVRtpPayloadTypes[i].enc_name; 00118 } 00119 00120 return ""; 00121 } 00122 00123 enum CodecID ff_rtp_codec_id(const char *buf, enum CodecType codec_type) 00124 { 00125 int i; 00126 00127 for (i = 0; AVRtpPayloadTypes[i].pt >= 0; i++) 00128 if (!strcmp(buf, AVRtpPayloadTypes[i].enc_name) && (codec_type == AVRtpPayloadTypes[i].codec_type)){ 00129 return AVRtpPayloadTypes[i].codec_id; 00130 } 00131 00132 return CODEC_ID_NONE; 00133 }